NASA Astronaut Ricky Arnold (@astro_ricky) — Astronaut (STS-119, Expedition 55/56, NEEMO 13, #CAVES2016)  & Educator. Currently onboard the @ISS  for Expeditions 55 and 56. Posts are my own.
Salar de Uyuni – the magnificent salt flats of #Bolivia where towering thunderst
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Salar de Uyuni – the magnificent salt flats of #Bolivia where towering thunderstorms go to die, thus forming the Atacama desert of #Chile
16.07.2018 13:48:57
‪The violent beauty of our dynamic Earth revealed by a volcanic plume alongside
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‪The violent beauty of our dynamic Earth revealed by a volcanic plume alongside Lake Atitlán in #Guatemala.‬
13.07.2018 15:35:18
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A stunning daytime traverse from #SanFrancisco southward through the Americas.
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A stunning daytime traverse from #SanFrancisco southward through the Americas....more
12.07.2018 13:56:39
The heart of #Madagascar drains into the sea due to decimation of rainforests &
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The heart of #Madagascar drains into the sea due to decimation of rainforests & coastal mangroves. #BetsibokaEstuary
11.07.2018 15:17:40
Visitors from deep space have visited Earth before and will again. Impact crater
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Visitors from deep space have visited Earth before and will again. Impact craters in #Quebec#Namibia#Arizona
10.07.2018 19:24:36
Recently a student asked me “how long would it take to get to the moon?” This @n
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Recently a student asked me “how long would it take to get to the moon?” This @nasa activity uses balloons to understand the relative sizes of Earth, Earth’s Moon and Mars, and their relative distance to each other. go.nasa.gov/2NkO7m3. #TeacherOnBoard
10.07.2018 15:00:51
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…throw off the bowlines. Sail away from safe harbor. Catch the trade winds in yo
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…throw off the bowlines. Sail away from safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover…” -Mark Twain #Bermuda
09.07.2018 14:35:58
The scattered remnants of the Aral (Sea of Islands) Sea in #Kazakhstan and #Uzbe
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The scattered remnants of the Aral (Sea of Islands) Sea in #Kazakhstan and #Uzbekistan, which used to be the 4th largest lake in the world. Diversion for agriculture has reduced the lake to 10% of its original size, resulting in desertification, economic collapse & public health issues. #TheStoryofWater
06.07.2018 15:46:32
Once we captured @spacex Dragon, ground controllers at @nasajohnson took over an
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Once we captured @spacex Dragon, ground controllers at @nasajohnson took over and berthed it to station. Enjoy the robotic ballet.
05.07.2018 21:24:54
The fireworks of #Kilauea  early this morning in #Hawaii.
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The fireworks of #Kilauea early this morning in #Hawaii....more
04.07.2018 17:49:56
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‪We hold these truths to be self-evident, that all men (people) are created equa
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‪We hold these truths to be self-evident, that all men (people) are created equal..”‬ ‪#HappyBirthdayAmerica from @iss! #FourthofJuly2018🇺🇸
04.07.2018 17:45:18
It may look like we are preparing for #WorldCup football, but @olegmks and I are
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It may look like we are preparing for #WorldCup football, but @olegmks and I are really conducting a test run of SPHERES satellites on @iss.
02.07.2018 20:05:33
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